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from peewee import *
from playhouse.fields import CompressedField as _CompressedField
from playhouse.hybrid import *
from playhouse.sqlite_ext import SqliteExtDatabase, ClosureTable
import datetime
from enum import Enum, unique
from pkg_resources import resource_filename
from .prefixes import query_pseudo_prefix
from .peewee_ext import EnumField
db = SqliteExtDatabase('test.db', pragmas=[('foreign_keys', 'ON')])
db.load_extension(resource_filename(__name__, 'sqlext/closure'))
__tables__ = []
__all__ = ['create_tables', 'drop_tables']
def table(cls):
__tables__.append(cls)
__all__.append(cls.__name__)
return cls
def create_tables():
db.create_tables(__tables__, True)
def drop_tables():
db.drop_tables(__tables__, True)
class BaseModel(Model):
__keys__ = []
@classmethod
def try_create(cls, **kwargs):
try:
return cls.create(**kwargs)
except IntegrityError:
return None
@classmethod
def create_or_get(cls, **kwargs):
if not __keys__:
raise ValueError("create_or_get not supported on %s" % cls.__name__)
for key in __keys__:
if key not in kwargs:
raise ValueError("required key '%s' missing" % key)
try:
return cls.create(**kwargs), True
except IntegrityError:
sel = {k:kwargs[k] for k in __keys__}
return cls.get(**sel), False
class Meta:
database = db
class CompressedField(_CompressedField):
def db_value(self, value):
return value if value is None else self.compress(value)
def python_value(self, value):
return value if value is None else self.decompress(value)
@table
class Document(BaseModel):
@unique
class Direction(Enum):
IN = 0
OUT = 1
content = CompressedField()
created = DateField(default=datetime.date.today)
inserted = DateTimeField(default=datetime.datetime.now)
description = CharField(null=True)
original_path = CharField(null=True)
file_type = CharField(null=True)
direction = EnumField(Direction, null=True)
@classmethod
def matches(cls, prefix, value):
return query_pseudo_prefix(prefix, value) or Document.id << (
DocumentTag.select(DocumentTag.document)
.join(Tag, on=Tag.matches(prefix, value)))
@table
class Prefix(BaseModel):
__keys__ = ('name',)
name = CharField(primary_key = True)
virtual = BooleanField(default = False)
description = CharField(null=True)
@classmethod
@db.atomic()
def create(cls, **query):
inst = super().create(**query)
Tag.create_prefix_default(inst)
@property
def default_tag(self):
return Tag.get(prefix = self, default = True)
def __str__ (self):
return self.name
def __repr__ (self):
ext = ' (virt)' if self.virtual else ''
return "<%s %s%s>" % (self.__class__.__name__, self.name, ext)
@table
class Tag(BaseModel):
__keys__ = ('name', 'prefix')
name = CharField()
prefix = ForeignKeyField(Prefix, null=True, related_name = 'tag', db_column = 'prefix')
description = CharField(null=True)
default = BooleanField(default = False)
@classmethod
def create_prefix_default(cls,prefix):
return cls.create(name = '*', prefix = prefix, description = "Default for prefix '%s'" % prefix, default = True)
@hybrid_method
def matches(self, prefix, name):
if isinstance(prefix, Prefix):
prefix = prefix.name
return (self.prefix_id == prefix) & (self.name == name)
class Meta:
indexes = [
(('name', 'prefix'), True)
]
@property
def prefixed_name(self):
if self.prefix_id:
return "%s:%s" % (self.prefix_id, self.name)
else:
return self.name
def __str__(self):
return self.prefixed_name
def __repr__(self):
return "<%s (#%d) %s>" % (self.__class__.__name__, self.id, self.prefixed_name)
@table
class DocumentTag(BaseModel):
document = ForeignKeyField(Document, related_name = 'tags')
tag = ForeignKeyField(Tag)
class Meta:
primary_key = CompositeKey('document', 'tag')
@table
class TagImplications(BaseModel):
tag = ForeignKeyField(Tag, related_name = 'implications')
implies_tag = ForeignKeyField(Tag, related_name = '_implied_by')
class Meta:
primary_key = CompositeKey('tag', 'implies_tag')
def __repr__(self):
return "<%s %d --> %d>" % (self.__class__.__name__, self.tag_id, self.implies_tag_id)
TagClosure = table(ClosureTable(
Tag,
referencing_class = TagImplications,
foreign_key = TagImplications.implies_tag,
referencing_key = TagImplications.tag))
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